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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2022 | Dec. 31, 2022 | Dec. 31, 2020 | Jun. 30, 2016 | Mar. 31, 2023 | Mar. 31, 2022 | Apr. 30, 2022 | Jun. 30, 2021 | May 31, 2021 | Jan. 31, 2020
Stock option plan |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 28,815 | $ 26,589 |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 238,400 |  |  |  |  |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  | 2 years 4 months 20 days |  |  |  |  |
Stock option |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 863,410 |  |  |  |  |
Forfeited (in shares) |  |  |  |  | 53,716 |  |  |  |  |
Expected dividend yield (as a percent) |  |  |  |  | 0.00% |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 21.18 |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 1,861,235 |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  | 2,000,000 | 1,000,000 |
Award requisite service period |  |  |  | 6 months |  |  |  |  |  |
Purchase price of common stock, percent |  |  |  | 85.00% |  |  |  |  |  |
Employee stock purchase plan, voting percentage limit |  |  |  | 5.00% |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 700 |  |  |  |  |
1998 Employee, Director, and Consultant Stock Option Plan, 2009 Equity and Long-term Incentive Plan, and 2013 Stock Incentive Plan | Common stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  | 0 |  |  |  |  |
Amended 2013 LTIP |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  | 6,598,348 |  |  |  |  |
Number of additional shares authorized (in shares) | 8,475,000 |  |  |  |  |  |  |  |  |
Amended 2013 LTIP | Maximum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | 16,724,212 |  |  |  |  |  |  |  |  |
2020 Inducement Stock Incentive Plan |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  |  |
2020 Inducement Stock Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |  |  |  |
2020 Inducement Stock Incentive Plan | Common stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  | 1,699,326 |  |  |  |  |
Number of additional shares authorized (in shares) |  | 1,700,000 | 1,000,000 |  |  |  |  |  |  |
2020 Inducement Stock Incentive Plan | Common stock | Maximum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  | 1,300,000 |  |  | 1,000,000
2020 Inducement Stock Incentive Plan | Stock option |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Stockholder's specified ownership percentage |  |  |  |  | 10.00% |  |  |  |  |
Inducement grants for non-statutory stock options (in shares) |  |  |  |  | 98,050 |  |  |  |  |
2020 Inducement Stock Incentive Plan | Stock option | Minimum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Stock options granted, exercise price as percentage of the fair market value of common stock at grant date |  |  |  |  | 100.00% |  |  |  |  |
2020 Inducement Stock Incentive Plan | Stock option | Maximum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Stock options granted to stockholder with specified ownership percentage, exercise price as percentage of the fair market value of common stock at grant date |  |  |  |  | 110.00% |  |  |  |  |
2020 Inducement Stock Incentive Plan | Restricted stock units |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 42,755 |  |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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